Dowel.



Patented June 21, 1910. I

H. A. UNDERWOOD.

a, a a

HORACE A. UNDERWOOD, OF KEWANEE, ILLINOIS.

DOWEL.

Specification of Letters Patent. Patented June 21, 191%.

Application filed March 16, 1910. Serial No. 549,62'345.-

To all whom it may concern: 1

Be it known that I, HORACE A. UNDER- WOOD, a citizen of the UnitedStates, residing at Kewanee, in the county of Henry and State ofIllinois, have invented a new and useful Dowel, of which the followingis a specification.

It is the object of this invention to provide a dowel pin so constructedthat it will be adapted to retain upon its exterior, a liberal supply ofglue, when the dowel pin is thrust into the parts which it is thefunction of the pin to hold together; the dowel in being so constructed,moreover, that it will be impossible for water to find its way into theopening in which the dowel pin is mounted; a contingency resulting indestroying the efficiency of the glue as a means for holding the dowelpin in place.

Dowel pins as heretofore constructed, have been provided with a sinuouschannel for the reception of glue, the channel winding about the pinfrom end to end and crossing-the end faces of pin. Moreover, inpins asthus constructed, it is impossible to pass a plane through the plug, atright angles to the axis thereof, without intersecting one of these glueholding channels. Consequently, when the dowel pin is mounted in place,with its outer end flush with the outer surface of the material in whichthe dowel pin is held, any water upon the surface of the substance inwhich the pin is mounted, will readily find its way downward, along oneof these sinuous" grooves, thus loosening and destroying the glue.Moreover, when two pieces of material are held together by a pin of thecharacter referred to, any liquid finding its way between adjoiningfaces of the elements held together the pin will, of a certainty, comeinto contact with one or more of these sinuous channels upon the pin,the moisture thus finding its way into the opening in which the pin ismounted, as certainly as though one of the end faces of the in wereexposed. These defects in channeled dowel pins, as at presentconstructed, it is the aim of this invention to overcome.

In the drawings, Figure 1 is a "sectional elevation of a dowel pinconstructed in accordance with my invention, the same having both of itsends inserted in'two blocks, which it is the function of the dowel pinto hold together. Fig. 2 shows in perspective, the dowel pin of myinvention. Fig. 3 is a section, showing another manner of mounting thedowel pin in place; and Fig. 4 is a top plan of the showing of Fig. 3.

In the drawings, the dowel pin is denoted by the numeral 1, and ispreferably circular in cross section. The pin is pro-' vided with aseries of annular, glue receiving grooves 2, extended around the pin inspaced planes normal to the axis of the pin, and defining in the pin, aseries of circums'cribing ribsB.

The numeral 6 denotes a pair of abutting structural elements, which itis the function of the dowel pin to hold together. These structuralelements have alined openings 5 for the reception of the dowel pin. Whenthe dowel pin is mounted in place in these openings 5, it will be seenthat one of the ribs upon the pin, denoted specifically by the numeral4, is extended across the plane AB, in which the abutting faces of theblocks 6 are located. Since there are no longitudinally extended groovesin the pin, this rib l will constitute a complete, and hermeticclosurefor the adjacent ends of the openings 5 in the blocks 6. Thus,any moisture, which may find its way between the blocks 6, in the planeA-B, will have no opportunity to find its way into the openings 5; andthus the glue or cement which is retained in the grooves 2 will beprotected and kept intact; The application, and specific utility of thedowel pin is, however, better illustrated in Figs. 3 and 4: of thedrawings. In the form thus shown, a pair of structural elements 7 and 8,are provided withv alined openings 11 and 12 respectively, the opening11 in the element 7 being extended entirely therethrough, while theopening 12 in the element 8 is extended but part way therethrough. Whenthe dowel pin is mounted in these openings 11 and 12, the rib 1 willserve as an hermetic closure for the adjacent ends of the openings 11and 12, while the uppermost rib 10 will serve as an hermetic closure forthe upper end of the opening 11 in-the block 7; the last mentionedfeature being. seen most clearly in Fig. 1.

In the construction shown in Figs. 3 and 4:,0116 face 9 of one of thestructural elements, is exposed directly to the weather, and it will beseen that the rib 10 Will prevent any moisture upon the face 9 fromfinding its way within the opening in which the pin is mounted, the rib4 serving, as in Fig. 1, to prevent any moisture from finding its wayinto the opening in which the pin is mounted, between the abutting facesof the elements 7 and 8.

It should be noted that the opening 12 in the block 8 is of sufficientdepth to position the rib t'properly to close the adjacent ends of theopenings 11 and 12 and likewise to position the rib 10 so that it willextend across the outer face of the structural element 7 thus closingthe outer end of the opening 11. The same observation holds true withrespect to the opening 5 in the block 6 of Fig. 1.

From the foregoing it will be seen that I have provided a dowel pin soconstructed that it will retain within its contour, sufficient glue tohold itself in place, the dowel pin being constructed, moreover, in sucha way that no moisture can find its way into those recesses in the pinin which the cement or glue is retained.

Having thus described the invention what is claimed is:

1. A dowel pin having annular cement receiving grooves extended aroundthe pin in spaced planes normal to the axis of the pin and defining inthe pin a series of circumscribing ribs, that rib which is located atthe end of the opening in which the pin is mounted, constituting anhermetic closure for said opening, thereby to prevent moisture fromfinding its way into the cement receiving grooves of the pin.

2. The combination with abutting structural elements, provided withalined openings for the reception of a do wel pin, of a dowel pinmounted in said openings, and

'cient depth to position one of said ribs having annular cementreceiving grooves extended around the pin in spaced planes normal to theaxis of. the pin and defining in the pin, circumscribing ribs, one ofsaid openings being of sufiicient depth to position one of the ribs inthe pin to extend across the plane of the abutting faces of thestructural elements to form an hermetic closure for the adjacent ends ofsaid openings.

3. The combination with abutting structural elements, one of which hasan opening extended part way theret-hrough, the other of which has anopening extended entirely therethrough, of a dowel pin mounted in saidopenings, and having annular, cement receiving grooves extended aroundthe pin in spaced planes normal to the axis of the pin and defining inthe pin, circumscribing ribs, the first named opening being ofsuffiextend across the of the structural elements, to form an her meticclosure for the adjacent ends of the said openings, and to positionanother of said ribs to extend across the outer face of the second namedstructural element to form an hermetic closure for the outer end of theopening in said element.

In testimony that I claim the foregoing as my' own, I have heretoaflixed my signature in the presence of two witnesses.

HORACE A. UNDERVVOOD.

to I plane of the abutting faces

